Part-A. State Eligibility Test Physical Sciences. (Model Answer Key)

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1 State Eligibility Test 2017 Physical Sciences (Model nswer Key) Part- -1 Q1 If f=tan (y/x) then div(grad f ) is equal to : -1 यद f=tan (y/x) ह त div(grad f ) म न ह ग 1 1-1/ -1/ 0 0 1/ 1/ Q2 What will be the cylindrical co : ए सदश वभव ordinates of the vector field ब लन र नदश

2 Q3 What will be the Eigen value of the given matrix : दय गय म स अभलण म न बत ऐ 0, 0, 3 0, 0, 3 1, 1, 1 1, 1, 1-1, 2, 3-1, 2, 3 1, 0, 3 1, 0, 3 nswer Key: 2 Q4 The differential equation dy/dt = y with the initial condition y(0)=1.2t, will expand as t tends to : 2 ए वभ द सम रण dy/dt = y जस % र भ दश y(0)=1.2t,ह त इस t ' स म न लय फ ल व ह ग? /2 1/2 nswer Key: Q5 : Inverse Laplace transform of will be %तल म ल पल स +प तर ह ग 2t e sinh5t

3 2t e sinh5t -2t e cosh5t -2t e cosh5t -2t e sinh5t -2t e sinh5t 2t e cos5t 2t e cos5t nswer Key: Q6 If x, y, z are non zero Hermitian operators which of the following relation must be false? : यद x, y, z ए श -य तर हरम शयन स र ह. त इनम/ स न स स ब ध गलत ह ग? xy + yx = z xy + yx = z xyz = z xyz = z [x.y] = z [x.y] = z x + y = z x + y = z Q7 What is the Fourier cosine transform of e? : -t2 e फ 2रयर स ईन +प तर य ह? -t2 -s2 e -s2 e -s2/2 e -s2/2 e -s2/4 e -s2/4 e -s2/4 e -s2/4 e nswer Key:

4 Q8 particle of mass M moves on a plane in the field of force : radial unit vector. The angular momentum of the particle about its origin will be? ए ण जस म 4 Mह ए समतल म/ बल स, जह 647य इ ई सदश ह, चल रह ह इस ण ण य स व ग म ल 6बन द पर य ह ग? Stationary <थर onserved स र Not-conserved स र नह> None of these are correct ई व?प सह> नह> nswer Key: Q9 particle moving under a central force describes the path r = a(1 cos ), then the force is inversely : propositional to ए ण -@>य बल अ तगत r = a(1 cos ) पथ पर चल रह ह, त यह बल ' स %तल म आन प त ह ग 2 r 2 r 3 r 3 r 4 r 4 r 5 r 5 r Q10 The Hamilton's canonical equation of motion in terms of Poisson rackets : प यसन ट पदF म/ गत ह.म?टन न न ल सम मरण ह ग are

5 nswer Key: Q11 The number of degree of freedom of a rigid body in space dimension is : ए Gढ़ प ड सम Jट वम म/ ' तन <वत 4त ट ह ग 2 2d 2 2d 6d 6d d(d+1)/2 d(d+1)/2 d(d+1)/d-1 d(d+1)/d-1 Q12 The Largrangian of a particle moving in plane under the influence of central potential is given by :. The generalized momentum corresponding to r and are ए समतल म/ चलत/ ह ऐ ण ल गर/ जयन ज ए -@>य वभव अ तगत, दय गय ह इस Kय प त स व ग rएव अन ल हFग

6 nswer Key: Q13 What will be Hamiltonian corresponding to Lagrangian : ल गर -जयन स गत ह मलट नयन य ह ग is nswer Key: Q14 n electron has kinetic energy equal to its rest energy. If the momentum of a photon is equal to this 2 : electron, what will be the energy of this photon?(you may need E 0 =m e c ) ए इल न गतज ऊज उस वर म ऊज बर बर ह यद ए फ ट न स व ग इस इल न 2 बर बर ह त इस फ ट न ऊज य ह ग? (दय गय ह E 0 =m e c ) E 0 E 0 E 0 E 0 E 0 E 0

7 nswer Key: Q15 Two particles are travel long in opposite direction with speed 0.9c relative to the laboratory. Their relative speed will be : द ण वपर>त दश ओ म 0.9 स गत स चल यम न ह. उन स प गत बत ऐ 0.948c 0.948स c स.98c.98स 0.995c 0.995स nswer Key: Q16 n electron falls from rest through a potential difference of 100 V. What is its de roglie wave length? : ए इल न 100 V वभव म/ वर म स न च Pगरत ह इस ड गल> तर गध य ह ग 12.3 nm 12.3 nm o 11.3 o 11.3 o 12.3 o nm nm nswer Key: Q17 Which one will be the quantum mechanical operator of a particle moving in : ए ण ए वम म/ चल रह ह, त उस व नटम य 64 %च ल हFग one dimension?

8 nswer Key: Q18 Which are the following wave functions acceptable in quantum mechanics? : व -टम म नस म/ <व त तर ग फल ह ग tanx tanx cosecx cosecx cotx cotx sinx sinx nswer Key: Q19 particle of massm is confined in the ground state of a one dimensional box extending from x = -2L to : x = +2L. The wave function of the particle in this state is The energy of eigen value corresponding to this state is where is constant. ए m म 4 ण प2र+Q ह ज ए वमय ब स म अपन नर तर अव<थ म x = -2Lस x = +2Lम/ चल रह ह इस ण तर ग फलन ह त उस इस दश अभलण म न बत ऐ,यद ए <थर ह

9 nswer Key: Q20 particle is described by a wave function : that it will be found in the region ए ण ए वम य दश म/ म/ % य त ह ग? in one dimension. What is the probability? तर ग फल दय गय ह त उस 4 -a e -a e -2a e -2a e -a 1 - e -a 1 - e -2a 1 - e -2a 1 - e nswer Key: Q21 What is the degeneracy of H - atom in state n = 3? : n = 3दश म/ H -अण अपRJटत ह ग

10 Q22 If and are two operators, then [,] will be : -1-1 यद और द %च ल ह त [,] म न ह ग [,] [,] -1 [, ] -1 [, ] -1 [,] -1 [,] -1-1 [, ] -1-1 [, ] nswer Key: 2 2 Q23 The commutator of [x, p ] is : 2 2 [x, p ] मय ट टर ह ग 2i (xp + px) 2i (xp + px) 2i (xp - px) 2i (xp - px) 2i px 2i px 2 2 2i (px + xp ) 2 2 2i (px + xp ) nswer Key:

11 Q24 The average value of p x, for the box normalized wave function, is : ए ब स %स म नय त तर ग फलन. ह त उस p x औसत म न ह ग 0 0 Q25 : Magnetic dipole of dipole moment is placed in a non-uniform magnetic field. If the position vector of the dipole is, the torque acting on the dipole about the origin is ए आघ ण च ब य अघ ण ह,उस ए असम न च ब य 4 म/ रख गय ह यद इस <थत सदश ह त इस पर लगन व ल बल आघ ण म न बत ऐ

12 nswer Key: Q26 Which one of the law provides the displacement current : नVन नयमF म/ स न स व<थ पन ध र बतल त ह Gauss Law Gauss Law Faraday s Law Faraday s Law mpere Law mpere Law iot Savart Law iot Savart Law Q27 If the magnetic monopole exists, which law is to be modified? : यद च ब य ए W व अ <तXव म/ ह त नVन म/ न स नयम म/ बदल व ल न ह ग nswer Key:

13 Q28 If coulomb gauze is : यद ल ब ग ज, then Lorentz gauze is given by ह त ल र -ज ग ज य ह ग nswer Key: Q29 For a magnetic vector potential : ए च ब सदश वभव, what will be its current density? ह त उस ध र घनXव य ह ग

14 nswer Key: Q30 t the interface of two non-conducting medium, the reflection coefficient for normal incidence is given by : द च ल म YयमF अ तर प Jठ पर,अभल ब आपतन लय %त6ब ब <थर ह ग nswer Key: Q31 : If is the guide wavelength, is cut off wave what is the rectangular wave equation? length and is the free space wave length, then यद पथ नध 2रत तर गध य, अ त य तर गध य तर गपथ लए सम रण ह ग तथ म त आ श तर गध य ह त ए आय त र

15 nswer Key: Q32 n air filled rectangular wave guide has dimension 6 x 4 cm. What is it guide wave length in TE 10 mode : if incident frequency is 3 GHz? ए आय त र 6 x 4 cm तर ग पथ हव स भर> ह यद आपतत त रग आव त 3 GHzह त TE 10 वध म/ पथ तर ग द ध य ह ग 28 cm 28 cm 19.8 cm 19.8 cm 19 cm 19 cm 10 cm 10 cm nswer Key: Q33 Scalar potential (r,t) of an electromagnetic wave satisfies : ए व[य त च ब य तर ग अदश वभव (r,t)नvन म/ स ' स स तJट ह ग

16 Q34 Which one of the following is correct for a common collector configuration of a transistor? : ए ज<टर उभयनJठ स \ ह> व-य स लय नVन म/ य सह> ह Low voltage gain, High output impedance, Low input impedance म वभव ल भ, अPध नगम %तब ध, म नव श, आगम %तब ध Unity voltage gain, High input impedance, Low output impedance ए वभव ल भ,अPध नगम %तब ध, म नगम %तब ध Very high voltage gain, Moderate input impedance, Low output impedance बह त अPध वभव ल भ, स म -य नव श %तब ध, म नगम %तब ध Moderate high voltage gain, Low input impedance and High output impedance स म -य स अPध वभव ल भ, म नव श %तब ध, अPध नगम %तब ध, nswer Key: Q35 alculate the efficiency of arnot engine working between 227 and 15 : o o ए रन ट ]जन 227 और 15 ब च यरत दत न ल/ 82.4 % 82.4 % 21.2 % 21.2 % 42.4 % 42.4 % 63.6 % 63.6 % o o

17 Q36 The boiling point of a liquid : ' उब ल 6ब द ecreases with increase of pressure दब व बढ़न स थ म ह त ह Increases with increases of pressure दब व बढ़न स थ बढ़त ह No change with pressure दब व स ई प2रवतन नह> ह त First increases then decreases पहल बढ़त ह और 'फर म ह त ह nswer Key: Q37 Entropy of the substance remains constant when the substance under goes : ए पद थ ए- प यद <थर ह त इस मतलब पद थम/ नVन म/ स न स प2रवतन ह ग Isothermal change समत प प2रवतन diabatic change +Q Jम प2रवतन Pressure change दब व प2रवतन Volume change आयतन प2रवतन nswer Key: Q38 If the number density of a free electron gas in three dimension is increased eight times, its Fermi : temperature will be यद ए म त इल न ग स नमबर घनXव त न वभ य दश म/ आठ ग न बढ़ ज य त इस फम^ त प ह ग Increase by a factor of 4 4 ग ण म/ बढ़ ग ecrease by a factor of 4

18 4 ग ण स घट ग Increase by a factor of 8 8 ग ण म/ बढ़ ग ecrease by a factor of 8 8 ग ण स घट ग nswer Key: Q39 Let W be the work done in a quasi static reversible thermodynamic process. Which of the following : statement about W is correct? ए <थ '?प उX_मण य ऊJम Pगत %_म म/ W य' य गय W लय नVन म/ स न स सXय ह W is a perfect differential if this process is isothermal यद %_म समत प य ह त Wए यथ तय अव ल ह W is a perfect differential if the process is adiabatic यद %_म +Q Jम ह त W ए यथ तय अव ल ह W is always a perfect differential Wहम श ए यथ तय अव ल ह ग W cannot be a perfect differential W भ भ यथ तय अव ल नह> ह ग nswer Key: Q40 t what temperature will the average speed of hydrogen molecule be the same as that of Nitrogen o : molecule at 35. You may need molecular weight of N 2 = 28 gm/mol and H 2 = 2 gm/mol. o ए ह इ` जन अण औसत गत, 35 पर न इ जन अण औसत गत बर बर ' स त पम न पर ह ग.आप दय गय ह आणव भ र N 2 = 28 gm/mol, H 2 = 2 gm/mol ह o 25 K o 25 K o 33 K o 33 K o 22 K o 22 K o 11 K o 11 K

19 Q41 The ensemble which allows the subsystems to exchange of energy as well as number of particles with a : reservoir is called. ए सम aचय ज उपत 4 ऊज तथ णF वनमय ड स थ अन मत रन द त ह उस नVन म/ स य ह/ग anonical ensemble न न ल सम aचय Micro canonical ensemble म इ_ ल न ल सम aचय Grand canonical ensemble व हत वहत सम aचय Pressure ensemble द ब सम aचय Q42 For a strongly degenerate Fermi gas, the specific heat is : ए मजब त अपभ Jटत फम^ ग स वशषट उJम ह ग Proportional to absolute temperature नरप त पम न आन पत Proportional to square of absolute temperature नरप त पम न वग अन प त Proportional to cube of absolute temperature नरप त पम न घन अन प त Independent of temperature त पम न पर नभर नह> nswer Key: Q43 JEFT always operates with the below process : ए JEFT हम श नVन म/ स ' स %'_य स थ य रत ह Gate to source p-n junction reverse bias ग ट और स स प -एन स Pध स थ Kय X_म वध म/

20 Gate to source p-n junction forward bias ग ट और स स प -एन स Pध स थ अ\दश वध म/ Gate to drain is grounded ग ट और ` न \ उ ड स ज ड़ ज त ह Gate is left open for building field to effect transistor functioning ग ट ख ल रखत ह त ' वभव स % 2रत ज<टर म र nswer Key: Q44 If the following program is run on an 8085 microprocessor, what will be value of and registers? : LX1H, 4031 PUSH H PUSH L POP POP HLT यद नVन % \ म ए 8085 म इ_ % स सर पर चल य ज य त और र ज<टर म न य ह ग?? LX1H, 4031 PUSH H PUSH L POP POP HLT 31 and 40 31एव and 31 00एव and 31 40एव 31

21 40 and 40 40एव 40 nswer Key: Q45 n / converter consists of : ए /प2रवत म/ नVन म/ स ' स स बनत ह / converter, amplifier /प2रवत,एVपल>फ यर omparator, counter and other gates त लन4, गण4 तथ अ-य ग ट omparator, clock, / convertor and counter त लन4, घड़, /प2रवत और गणत lock, amplifier, oscillator and comparator घड़, एVपय फ यर,द ल तथ त लन4 Q46 In a 8085 microprocessor, if the starting address of a 4 K memory is 2000 H, what will be the last : address? ए 8085म इ_ % स सर म/ 4 K म म र> %थम पत 2000 Hम/ ह त उस अ तम पत य ह ग 23EF H 23EF H 2FFF H 2FFF H 20FF H 20FF H 4FFF H 4FFF H nswer Key: Q47 small increases in collector reverse bias, will cause : ए स \ ह> Kय X_म वध म/ थ ड़ स बढ न पर ह ग Large increase in emitter current उXसज ध र म/ 7य द बढ़ तर>

22 large increase in collector current स \ ह> ध र म/ 7य द बढ़ तर> Very large decrease in collector voltage स \ ह> वभव म/ बह त 7य द म Very small change in collector reverse saturation current स \ह> Kय X म स त eत ध र म/ बह त थ ड़ प2रवतन nswer Key: Q48 In the ose - Einstein condensates the particles : ब स -आइ-सट>न णF नVन म ' स म/ स स घनत रत ह Have inter particle attraction जनम/ ण तर आ षण ह ondense in real space व <तव सम Jट म/ स धनत Have overlapping wave functions अतKय प तर ग फलन ह Have large and positive chemical potential 7य द और धन Xम रस यन वभव ह Q49 n ideal op-amp is used to make an inverting amplifier. The two input terminals of the op-amp are at : the same potential because ए आदशऑप-एVप %तल म एVपल>फ यर +प म/ %य ग' य ज त ह उस द न नव श ए सम न वभव पर ह त ह. यF' - Two input terminals are directly shorted internally द न नव श सर अ दर स लघ पPथत ' य ज त ह Input impedance of the op-amp is infinity नव श %तव ध अ न त ह त ह Open drop again and MRR are infinity ख ल प श ल gध और स एमआरआर अन त ह Slew rate is very small

23 सलय र ट बह त म ह Q50 The effect of doping intrinsic semi conductor is to : ए न ज अधच ल म/ यद ड प ग ज य त य %भ व ह ग Move Fermi level towards the centre of forbidden band फम^ ल वल -@ व जत पh तरफ खस Move the Fermi level away from the centre of the forbidden band फम^ ल वल -@ व जत पh स द र खस hange the crystal structure of the semiconductor अधच ल स रचन म/ प2रवतन Keep the Fermi level at the middle of the forbidden band फम^ ल वल -@ व जत पh ब च म/ रखन लय nswer Key: Part- Q1 To solve Laplace equation in spherical coordinate system when it is symmetric about z-axis, one of the : following methods can be used. Which is/are true? I. ssociated Legendre's Function II. Legendre's Polynomial III. essel Function ए ग ल>य नदष म/ ल पल स सभ रण हल रन लय, ज z-axis स अ य सममत ह, नVन म/ स न स तर> सह> ह ग I. सहच र> Legendre'sफलन II. Legendre's बह पद III. esselफलन Only I and III वल Iऔर III only II वल II Only III

24 वल III II and III IIऔर III nswer Key: Q2 With which boundary conditions, the ordinary Green's function does : equation. not exist for the differential न स प2रस म %तब ध लय ए स ध रण \ न फलन अव लन लय नह> ह ग nswer Key: Q3 : a-iv,b-iii,c-i,d-ii

25 ए-iv,ब -iii,स -i,ड -ii a-iii,b-iv,c-i,d-ii ए-iii,ब -iv,स -i,ड -ii a-ii,b-iv,c-iii,d-i ए-ii,ब -iv,स -iii,ड -i a-i,b-ii,c-iv,d-iii ए-i,ब -ii,स -iv,ड -iii Q4 What is the order of error in Simpson's 3/8 rule of numerical integration? : सVपसन 3/8 नयम स सम लन म/ ' स ट गलत ह 2 O (h ) 2 O (h ) 3 O (h ) 3 O (h ) 4 O (h ) 4 O (h ) 5 O (h ) 5 O (h ) Q5 To group of order less than 4 is : 4 स म ट सम ह lways cyclic हम श च_य lways non-cyclic हम श अच_य May or may not be cyclic ह स त य नह> च_य yclic under some conditions च_य ' स ख स दश म/ nswer Key:

26 Q6 If the components of a tensor are zero in one coordinate system, then which of the following : observations is/are true? I. omponents are not zero in any system II. omponents are zero in only one - coordinate system III. omponents are zero in all coordinate system यद ए नदश म/ ए %दश अ श श -य ह. त नVन म/ स I. ' स म/ भ स<टम म/ अ श श -य नह> ह II. अ श वल ए नदश म/ श -य ह. III. सभ नदश F म/ अ श श -य ह. न स सXय ह Statement I and II IIIऔर II थन Statement III only III थन Statement II only II थन Statement II and III IIऔर III थन nswer Key: Q7 The canonical transformation Q = p, P = -q is generated by the generating function : वहत +प -तर Q = p, P = -q जन फलन [व र उXप दत ' य ज त ह त F = qp F = qp F = qq F = qq F = pq F = pq F = pp F = pp nswer Key: Q8 Which of the following is/are false? : नVन म/ स न स गलत ह

27 The Poisson bracket of momentum, conjugate to a cyclic coordinate with Hamiltonian vanishes प यसन ट स व ग ह म?ट नयन स थ ज च_य नदष स थ स य iमत ह,खXम ह ज त ह Lagrangian bracket is in varied under anonical transformation वहत +प -तर अ तगत ल गर/ जयन ' ट नJचर ह Poisson bracket changes sign under communication of concerned dynamical variables प यसन ' ट, दप2रवतन गह चर अ तरगत अपन Pच ह बदल ल त ह Lagrangian bracket is commutative with respect to concerned dynamical variables ल गर/ जयन ' ट गत चर अ तरगत दप2रवतन ह nswer Key: Q9 If {l x, x} is the vanishing Poisson bracket, tell which of the following relation/relations is/are false for : Poisson bracket? (I) [l x, l y ] = -l z (II) [l x, l z ] = -l y (III) [l z, l y ] = -l x यद {l x, x}ए ल eत प यसन ' ट ह त नVन म/ स (I) [l x, l y ] = -l z (II) [l x, l z ] = -l y (III) [l z, l y ] = -l x न स प यसन ' ट गलत ह I and II Iऔर II Only II वल II Only II and III IIऔर III Only I वल I nswer Key: Q10 Hamilton's canonical equations of motions are : ह म?टन गत वहत सम रण य ह ग

28 nswer Key: Q11 : a-iv,b-iii,c-ii,d-i ए-iv,ब -iii,स -ii,ड -i a-iii,b-ii,c-iv,d-i ए-iii,ब -ii,स -iv,ड -i a-iv,b-i,c-ii,d-iii

29 ए-iv,ब -i,स -ii,ड -iii a-i,b-ii,c-iv,d-iii ए-i,ब -ii,स -iv,ड -iii nswer Key: Q12 What will be the normal frequencies of normal modes of vibration of the system characterized by the : Lagrangian ल गर/ जयन पन %स म -य आव त य ह ग [व र अभल ण स<टम %स म -य वध nswer Key: Q13 Which statements are true for normal dispersion in a electromagnetic wave? : (I) Refractive Index increases as wavelength increase (II) Refraction index decrease as wavelength increase (III) Slope of the curve is greater at shorter wavelength. (IV) Normal ispersion is given by ए व[य त चब प तरग लय %स म -य प2र पण लय न स थन सXय ह I. तर गदध य बढ़न पर अपवत न बढ़त ह II. तर गदधय बढ़न पर अपवतन घटत ह

30 III. व_ड ढ़ ल न जय द ह त ह,छ ट> तर गद ध य पर IV. %स म -य प2र पण I, II and III I,IIऔर III II and IV IIऔर IV II and III IIऔर III II, III and IV II IIIऔर IV Q14 Which one of the following remains invariant under Lorentz transformations? : ल र/ज +प नतरण अ तगत न स अप2रवतन य ह nswer Key: Q15 The potential which exhibits the dependence of potentials on the velocity of the particle is known as : न स वभव गत पर नभर रत ह Scalar Potential अदश वभव

31 Vector Potential सदश वभव Retarded Potential म दत वभव Lienard - Wiechort Potential ल>न ड-वच ट वभव nswer Key: Q16 Which statements are true for the boundary conditions in a waveguide? : (I) Normal derivative of magnetic field at the surface is zero (II) Tangential component of electric field is not zero. (III) Normal derivative of magnetic field at the surface (IV) Tangential component of electric Field is zero तर ग पथ लय प2रस म %तब ध य ह ग (I) च ब य 4 (II)व[य त 4 (III) च ब य 4 (IV)व[य त 4 ल ववत अव लन प र समतल पर श -य 64टय य अ श श -य नह> ह ग ल ववत अव लन प र समतल पर श -य नह> ह ग 647य य अ श श -य ह ग I and IV Iऔर IV I and II IIऔर II II and III IIऔर III II and IV IIऔर IV nswer Key: Q17 When a particular mode is excited in a a wave guide there appears a magnetic field in the direction of : propagation also. The resulting mode is जब ए तर ग पथ वष श वध म/ उXत जत ' य ज त ह त च ब य 4 उस गत दश म/ ह त ह त इस न स वध ह/ग Transverse electric mode TEवध

32 Transverse Magnetic mode TMवध TEM mode TEMवध avity resonator वट> र ज न टर nswer Key: Q18 : The in-homogenous electromagnetic wave equations using Lorentz gauge given by ए असम ग व[य त च ब य त रग नVन स %दशत र स त ह यद ल र/ज ग ज दय गय ह Q19 : Using oulomb gauge, which is the e.m. wave equations are true? ल व ग ज %य ग रत ह ए नVन म/ न स सXय ह

33 nswer Key: Q20 Given a wave with dispersion relation = ck + m for k > 0 and m > 0, which statement is true? : I. Group velocity is greater than phase velocity II. Group velocity is less than the phase velocity III. Group and phase velocity are same IV. Group velocity is finite but phase velocity is zero k > 0और m > 0 लय ए तर ग प2र पण स वध = ck + mह त न स थन सXय ह I. सम ह व ग ल व ग स 7य द ह II. सम ह व ग ल व ग स म III. सम ह और ल व ग द नF सम न IV सम ह व ग स मत तथ ल व ग श -य I and II Iऔर II only II वल II only IV वल IV Only I and III Iऔर II nswer Key: Q21 The energy in the ground state of the hydrogen atom can be calculated as : ह इ` जन परम ण नVनत अव<थ ऊज ' स तर> स k त र/ग Variation method व 2रय सन म थड WK approximation WK ए% सम सन तर> oth variation and WK approximation द नF व 2रयसन एव WK None of these ई नह>

34 nswer Key: Q22 The WK approximation is used to the system where : WK ए% स शन %य ग ' स %ण ल> लय ' य ज त ह जह Potential function vary rapidly वभव त गत स बदलत Potential function vary fast वभव फलन त ज बदलत Potential function vary slowly वभव फलन ध र ध र Potential function has no relation with WK approximation वभव फलन WK ए% स म स स ई स ब ध नह> ह Q23 Which statement is correct? : न स थन सXय ह -य न % lन Scattering of neutrons by electrons gives about the structural properties of the nucleus इस न,-य ल>यस स रचगXम ग ण k न द त ह From a nucleus gives the idea about the magnetic properties of the nucleus -य ल>यस च ब य वश षत From a nucleus gives idea electrical properties of the nucleus -य ल>यस व[य त य वश षत ll of these ऊपर सभ nswer Key: Q24 The orn approximation will be hold good only when, : ब न ए% स म सन सXय ह ग यद The wave function must differ with larger value from the incident wave function. तर ग फलन,आपतत तर ग फलन स फ बड़ The wave function is not much different from the incident wave function.

35 तर ग फलन,आपतत तर ग स बह त अलग नह> ह The wave function must be same with the value of the incident wave function. तर ग फलन और आपतत तर ग फलन ए ज स ह Wave function has no relation with this. तर ग फलन इसस ई स ब ध नह> ह nswer Key: Q25 The dipole moment amplitude p 0 in terms of charge (q) and acceleration : QW व आध ण आय म p 0 आव श (q)और तवरण पदF म/ of accelerated charge is: nswer Key: Q26 :

36 -II,-III,-IV,-I ए-II,ब -III,स -IV,ड -I -I,-IV,-III,-II ए-I,ब -IV,स -III,ड -II -III,-IV,-I,-II ए-III,ब -IV,स -I,ड -II -I,-III,-IV,-II ए-I,ब -III,स -IV,ड -II nswer Key: Q27 Scattering cross section is given by : % णप2र 4 नVन स दय ज य ग <थर म न nswer Key:

37 Q28 : ssertion (): If Reason (R): Mark your answer as नश चय मक कथन ए: यद are irac matrices then mडर म ह त ह त आर: oth () and (R) are true and (R) is the correct explanation of () (ए)और (आर)द नF सXय तथ (आर), (ए) Kय nय रत ह oth () and (R) are true and (R) is not the correct explanation of () (ए)और (आर)सXय पर-त (आर), (ए) Kय nय नह> रत () is true but (R) is false (ए)सह> ल ' न (आर)गलत () is false but (R) is true (ए)गलत ल ' न (आर)सह> nswer Key: Q29 : ssertion (): Klein - Gordan equation is valid for electron Reason (R): The Klein - Gordan equation is valid only for spin less particles orbiting about nucleus Mark your answer as नचय मक कथन ए: ल>न ग डन सम रण ए इन न लय ह त आर: ल>न ग डन सम रण वल <पनवह>न सह> ह णo लय ज -य स मस च रF और घ म रह ह oth () and (R) are true and (R) is the correct explanation of () (ए)और (आर)द नF सXय तथ (आर), (ए) Kय nय रत ह oth () and (R) are true and (R) is not the correct explanation of () (ए)और (आर)सXय पर-त (आर), (ए) Kय nय नह> रत () is true but (R) is false (ए)सह> ल ' न (आर)गलत () is false but (R) is true (ए)गलत ल ' न (आर)सह>

38 nswer Key: Q30 ssertion (): The charge and current densities defines by and satisfy the continuity : equation Reason (R): For free particle, the orbital angular momentum is not a constant of motion. Mark your answer as नचयत मक कथन ए: आव ष और ध र घनXव, ज-ह/ और स दष य गय, स तXय सम रण स त Jट रत ह ह त आर: ' स म Xतम ण लय य ण य स ब ग <थर नह> ह ग oth () and (R) are true and (R) is the correct explanation of () (ए)और (आर)द नF सXय तथ (आर), (ए) Kय nय रत ह oth () and (R) are true and (R) is not the correct explanation of () (ए)और (आर)सXय पर-त (आर), (ए) Kय nय नह> रत () is true but (R) is false (ए)सह> ल ' न (आर)गलत () is false but (R) is true (ए)गलत ल ' न (आर)सह> nswer Key: Q31 Increase in entropy, when one gram of water at 0 is raised to 1 gm of water at 100 : o o यद ए \ म प न 0 त पम न 100 व ल ए \ म प न गम ' य ज य त ए- प ' तन बढ़ ग al/k al/k al/k al/k al/k al/k al/k al/k o o Q32 Wein's displacement law states that the monochromatic emissive power varies directly : वय न व<थ प नयन स ए र ग य उXस जत श त ' स आन प त बदलत ह Square of the absolute temperature. as the

39 नरप त पम न वग ube of absolute temperature. नरप त पम न घन Fourth power of absolute temperature. नरप त पम न चत थ प वर Fifth power of absolute temperature. नरप त पम न प चव प वर nswer Key: Q33 Which statement is correct? : न स थन सXय ह The wave function is symmetric under interchange of two bosons. तर ग फलन सममत ह त ह यद द ब स -स वनयम र/ The wave function is symmetric under interchange of two fermions. यद द फरमय -स वनमय र त तर ग फलन सममत ह त ह The wave function is asymmetric under interchange of two bosons. तर ग फलन असमतत ह ग यद द ब स न वनयम र/ ll are true. सभ सXय nswer Key: Q34 Match the following : नVन मल न र

40 -I,-III,-IV,-II ए-I,ब -III,स -IV,ड -II -IV,-II,-I,-III ए-IV,ब -II,स -I,ड -III -III,-II,-I,-IV ए-III,ब -II,स -I,ड -IV -III,-IV,-II,-I ए-III,ब -IV,स -II,ड -I nswer Key: Q35 What will be the mean free path, if molecular diameter is and molecular density is n per unit : volume यद आणव Kय स ह और आणव घनXव n%त घन ह त औसत म Xतम प थ k त र/

41 nswer Key: 2 1/2 Q36 The root mean square speed < v > for Maxwellian distribution of velocities of gas molecules will be : 2 ' स ग स म सव लयन वतरण वग म Yयम ल गत< v > 1/2 य ह ग Q37 The Ising model investigates the behavior of substances whose molecules poses : ' स पद थ <वभ व Ising modelस ज च र जस अण : Electric dipole moment. व[य त [वW व आप ण Magnetic flux. च ब य pलस Magnetic moment. च ब य घ णन Electric flux. व[य त pलस Q38 In a pressure transducer, we use : ए दवव सडय सर म/ न स %य ग ह त ह Strain gauge.

42 < न ग ज Hall effect transducer. ह ल %भ व सडय सर Photo emissive cell. % श उXस जत स ल Photo transistor. % श ज<टर nswer Key: Q39 Gauge factor of a transducer is defined as : ग ज ग ण ' स -सडय सर स प2रम 64त र/ग nswer Key:

43 Q40 : test is ई वगपर>ण ह nswer Key: Q41 : - I, -II, -IV,- III ए -I,ब - II,स - IV,ड III -III,- I,-II,-IV ए -III,ब -I,स - II,ड IV -II,- I,-III,-IV ए- II,ब - I,स - III,ड IV

44 - I,- III,- II,-IV ए- I,ब - III,स -II,ड - IV Q42 ssertion (): Strain gauge is a semi conducting material : Reason (R): Resistance changes when pressure is applied Mark your answer as नशचय मक कथन ए: < न ग ज ए अधच ब पद थ ह ह त आर: दव ब स थ %तर ध बदलत ह न च दय त न %श नF नVन न स र उXतर द oth () and (R) are true and (R) is the correct explanation of () (ए) और (आर) द नF सह> और (आर), (ए) सह> Kय nय रत ह oth () and (R) are true and (R) is not the correct explanation of () द नF (ए)और (आर)सह> पर-त (आर), (ए) सह> Kय nय नह> रत स () is true but (R) is false (ए)सह> ल ' न (आर)गलत () is false but (R) is true (ए)गलत ल ' न (आर)सह> nswer Key: Q43 ssertion (): Transducer converts physical quality to electrical quantity : Reason (R): Piezoelectric effect tells about conversion of voltage when current is applied Mark your answer as नशचय मक कथन ए: सडय सर ए भ त प2रम ण स व[य त प2रम ण म/ बदलत ह ह त आर: प ज इल > पद थ जव ध र %व ह रत ह त वभव उXप-न रत ह oth () and (R) are true and (R) is the correct explanation of () (ए) और (आर) द नF सह> और (आर), (ए) सह> Kय nय रत ह oth () and (R) are true and (R) is not the correct explanation of () द नF (ए)और (आर)सह> पर-त (आर), (ए) सह> Kय nय नह> रत () is true but (R) is false (ए)सह> ल ' न (आर)गलत () is false but (R) is true

45 (ए)गलत ल ' न (आर)सह> Q44 ssertion : If the maximum peak to peak voltage of M wave is 16 mv and the minimum peak to peak voltage is 4 mv, then modulation factor is 0.6. : Reason R: Modulation factor Mark your answer as नशचय मक कथन ए: यद ए Mतर ग च ट> स च ट> वभव 16 mv ह और च ट> स च ट> -य मतम वभव 4 mv ह त उस म ड ल सन ग ण 0.6ह ह त आर: म ड ल सन ग ण oth () and (R) are true and (R) is the correct explanation of () (ए) और (आर) द नF सह> और (आर),(ए) सह> Kय nय रत ह oth () and (R) are true and (R) is not the correct explanation of () (ए)और (आर)सह> पर-त (आर),(ए) सह> Kय nय नह> रत () is true but (R) is false (ए)सह> ल ' न (आर)गलत () is false but (R) is true (ए)गलत ल ' न (आर)सह> nswer Key: Q45 : The inverse Fourier Transform of the function फलन %तल म फ 2रयर +प -तरण य ह ग sin sin cos cos sin(t) sin(t) t t t t cosec(t) cosec(t)

46 Q46 The frequency dependence of noise power and noise voltage is : श र श त और श र व?टत आव त ' स पर आPqत ह Noise Power Jष र श त and Noise Voltage और Jष र oth varies as श र व?टत oth Noise Power and Voltage vary as द नF श र श त तथ व?टत Noise Power श र श त and Noise Voltage और श र व?टत nswer Key: Q47 For digital modulation of the signals, MOEM uses : MOEMम/ न स अ य म ड ल सन %य ग ह त ह SK and PSK SKऔर PSK FSK and SK FSKऔर SK PSK and FSK PSKऔर FSK SK, FSK and PSK SK, FSKऔर PSK

47 Q48 Probability of error in FSK is : FSKम/ 4 टयF % य' त य ह nswer Key: Q49 Which statement is correct? : न स थन सXय ह ll unit cells are primitive cells. स र ए स ल अभ 7य स ल ह ll the primitive cells need not to be unit cells. स र अभ 7य स ल ए स ल हF, ज+र> नह> The unit cell is not related with primitive cells. ए स ल अभ 7य स ल स ई स ब ध नह> ll of these are correct. सभ सXय ह nswer Key:

48 Q50 simple intercepts ata,b/2, 3c in a simple cubic unit cell. The Miller indices of the plane are : ए समतल ए घन स ल a,b/2, 3c पर ख ड रत ह त उस मलर ईड ईसस य ह ग (1 3 2) (1 3 2) (2 6 1) (2 6 1) (3 6 1) (3 6 1) (1 2 3) (1 2 3) Q51 Which is / are the correct statements? : I) ebye theory of specific heat is based on that all atoms are vibrating with same frequency. II) ebye theory of specific heat is based on all atoms are vibrating with different frequency. III) ll atoms are vibrating with same energy. न स थन सXय ह I. वशJट ऊJम mडब ई स Yद -त इस ब त पर आध 2रत ह ' स र/ परम ण ए ह> आव त पर पन रत ह II. वशJट ऊJम mडव ई सYद -त म/ सभ परम ण अलग-अलग आव तयF पर पन रत/ ह III. स र परम ण ए ह> सम न ऊज पर पन रत/ ह Only I and III वल Iऔर III Only III वल III Only II वल II I and II वल Iऔर II

49 Q52 phonon of wave vectork interacts with other particles and fields as if its momentum were : ए फ न न तर ग सदष k अ-य उणF और 4F प र<प2र ' य रत ह यद उस स व ग: nswer Key: Q53 If H c is critical mag. field for a Superconductor and T c is transition temperature, then : ए अत च ल _ त च ब य 4 H c और स _मण त प T c ह त nswer Key: Q54 Width of the depletion layer in a p - n junction diode is given by : p - n ज व-स ड य ड [व स <तर च ड़ ई य ह ग

50 Q55 For an intrinsic semiconductor m e * and m h * are the effective,asses of electrons and holes near the corresponding band edges. t a finite temperature the position if the fermilateral. : ए न ज अधच ल म/ m e *और m h * इल और ह ल %भ न उस पh र स गत ह ए प2रम त त पम न पर फम^ तल <थत बत य/ depends on m e * but not on m h * m e *पर आध 2रत ह ल ' न m h *पर नह> depends on m h * but not on m e * m h *पर आध 2रत ह ल ' न m e *पर नह> depends on both m e * and m h * द नF m e *और m h *पर आध 2रत Neither on m e * nor on m h * m e *और m h *पर आध 2रत नह>

51 Q56 The unit Hall coefficient R H is : ह ल <थर R H इ ई य ह nswer Key: Q57 The normalized wave function for a particle in a rectangular box of dimensiona,b,c is : ए ण %स म -य त तर ग फलन न ल/ यद ए आयत य व स जस वभ य a,b,c ह

52 None of these are correct ई भ नह> nswer Key: Q58 If E F is the Fermi energy of a metal at 0 K and E is the fermi energy att K then : यद ' स ध त फम^ ऊज 0 Kपर E F ह तथ T Kपर E ह त nswer Key: Q59 For a given dielectric as the temperature increases, the ionic polarizability : ए पर व [य त लय यद त पम न बढ़ य त इस आयनत W वणत य ह ग Increases. बढ़त ह ecreases.

53 घटत ह Remains unchanged. ई प2रवतन नह> Varies sinusoidally. स इन स इmडयल तर> स बदल ग Q60 In a Frenkel defect, : ए r - ल द ष म/ Positive ion goes at substitutional site and keeps charge neutrality. घन Xम आयन %त<थ पत जगह पर ज त ह और आव श उद स नत रखत ह Positive ion goes at interstitial site maintaing charge neutrality. घन Xम आयन अ तर ल> जगह पर ज त ह और आव श उद स नत रखत ह Positive charge goes at interstitial and negative goes at substitution site. घन Xम आयन अ तर ल> जगह पर ज त ह और ऋण Xम आयन %तसथ पत जगह पर Negative ion goes at the surface and positive ion at interstitial disturbing charge neutrality. ऋण Xम आयन प Jठ पर ज त और घन Xम आयन अ तर ल> जगह पर ज त ह और आव श उद स नत बदल ज त nswer Key: Q61 n atom of mass M can be exited to a state of mass (M + ) by phonon capture. The frequency of a : photon which can cause this transition is ए Mम 4 परम ण उXत जत ह र (M + ) म 4 म बदलत ह और फ न न [व र %\हण र लय ज त ह फ ट न आव Xत ज इस स _मण ल त ह

54 nswer Key: Q62 ngular momentum quantisation is directly established by : I) Photo electric effect and avison Germar experminet II) Stern - Gerlach experment and Frank - Hertz experiment III) Stern - Gerlach experiment IV) Frank - Hertz experiment ण य स ब ग व ट इज सन स ध त र पर नVन [व र %तप दत ' य गय ह I. फ ट इल > %भ व और ड व सन जमर %य ग II. <टन ग रल %य ग तथ r तथ हड %य ग III. <टन ग रल %य ग IV. r/ और हड %य ग I and II Iऔर II Only III वल III Only IV वल IV Only II वल II nswer Key:

55 Q63 Optical spectrum is the characteristics of the : % शय <प म ' स [व र मलत ह ll electrons in the atom. सभ इल न व अण ओ स ll protons on the nucleus. सभ % ट न स Valence electrons. स य ज इल न स Nucleons only. -य लय न स Q64 oublet - doublet transition will be due to : [वध व य-[वध व य स _मण ' स रण ह 2 2 5/2 P 3/ /2 P 3/ /2 S 3/ /2 S 3/2 2 2 P 3/2 S 1/2 2 2 P 3/2 S 1/2 2 2 P 3/2 S 3/2 2 2 P 3/2 S 3/2 nswer Key: Q65 :

56 - I, - III, - II, - IV ए-I, ब -III, स - II, ड -IV - II, - III, - IV, - I ए-II, ब -III, स -IV, ड - I -II, -I, -III, - IV ए -II, ब - I, स -III, ड - IV -II, -III, - IV, - I ए -II, ब -III, स - IV, ड - I nswer Key: Q66 What will be the frequency at which electron orbital magnetic moment processes in a magnetic field? : ए इल न य च ब य आघ ण स च ब य 4F म/ प र<सरण र रह ह त उस आव त य ह ग

57 Q67 In a Kerr effect experiment : the plane of polarization by Where K is Kerr constant, then voltage necessary for rotating /2 is known as ए र %भ व %य ग म उपय त व?ट ज य हत ह ह जह Kफ र <थर ह त W वण समतल /2 म घ म न लय Kerr voltage. र ब?ट ज Quarter wave voltage. वटर तर ग ब?ट ज Half wave voltage. अध तर ग व?ट ज Polarization voltage. W वण व?ट ज Q68 The difference in a stimulated emission and spontaneous emission is : उt पत उXसजन और <वत: उXसजज म/ य अ तर ह The incident wave determines the direction and phase in stimulated while no definite phase in spontaneous emission. उt पत उXसजन म/ आपतत तर ग दष और ल नध 2रत ह जब' <वत: उXसजन म/ ई न Jचत ल नध 2रत नह> ह The incident wave determines the direction in stimulated but same phase in spontaneous emission. आपतत तर ग उt पत उXसजन म/ दष ल ' न <वत:उXसजन म/ ए ह> ल नध 2रत रत ह oth direction and phase are not determined by incident wave in stimulated while direction and phase both are maintained in spontaneous emission. द न दष और ल द नF उt पत उXसजन स नध2रण नह> ह त ह तथ दष और ल <वत:उXसजन स नध 2रत ह त ह There in no phase and directions are changed in both emissions.

58 द नF उXसजन म/ ई ल और दष नह> बदलत nswer Key: Q69 The minimum photon energy required for e e pair production is 2mc, hence its corresponding : wavelength is e e य गम उXप द लय नVनतम फ ट न ऊज 2mc, बर बर ज+रत ह त ह त इस स गत तर ग ल ब ई य ह ग X 10 m X 10 m X 10 m X 10 m X 10 m X 10 m X 10 m X 10 m nswer Key: Q70 Find the threshold energy for the pion production in the reaction N + N 2 2 : M N c =940 MeV and m c = 140 MeV. ए N + N +, पVयन उXप द अम' य म/ द हल> आव त बत ऐ यद 2 2 M N =940 MeVऔर m = 140 MeV. 300 MeV 300 MeV MeV MeV MeV MeV MeV MeV nswer Key: N + N +. You may require Q71 What is the parity of an - particle : ए - ण प 2रट> य ह ग -1

59 nswer Key: 2 4 Q72 Find the energy release, if two 1 H nuclei can fuse together to form 2 He nucleus. The binding energy 2 4 : per nucleon of 1 H and 2 He is 1.1 MeV and 7.0 MeV respectively. 2 4 यद द, 1 H -य लयस स गलत ह र 2 He -य लयस बन त ह त ' तन ऊज उXस जत ह ग 2 4 यद 1 H और 2 He %त -य लय ई ब धन ऊज 1.1 MeV और 7.0 MeVद> गय ह 23.6 ev ev MeV MeV MeV MeV ev ev. nswer Key: Q7 3 : नVन मल न र उXतर द/

60 nswer Key: Q74 : Match the following. मल न र उXत र द/

61 Q75 The decay process : य %_म violates इनम/ स ' स प लन नह> रत ह aryon Number ब 2रयन स nय Lepton number ल eट न स nय Isospin आइस <पन

62 Strangeness < -जन स

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